解答: (a)f(x,y)=x^2+xy+y^2-6x+2fx(x,y)=2x+y-6fy(x,y)=x+2y令2x+y-6=0x+2y=0解聯立方程式得到,x=4,y=-2所以,critical point at (4,-2)fxx(x,y)=2fyy(x,y)=2fxy(x ...
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